SEMICONDUCTOR SENSITIZATION BY RUS2 COLLOIDS ON TIO2 ELECTRODES

RuS2 (n-type) colloids were prepared in sulfolane by a new technique. Diluted ruthenium disulfide colloidal suspension in sulfolane showed g reen photoluminescence. The photoelectrochemical behavior of TiO2 elec trodes coated with RuS2 colloids was also investigated. These electrod es showed spectral sensitization effect by RuS2 on TiO2 with an increa se in the photocurrent response of TiO2 towards longer wavelength spec tral region. Photocurrent action spectra of these electrodes qualitati vely suggested a band-gap of approximately 2.2-2.8 eV for RuS2, quite wider than that of the bulk material showing size quantization effect. I-V measurement showed a flat-band potential of approximate to -0.15 V (versus Ag/AgCl) for these samples.